Goto Section: 15.107 | 15.111 | Table of Contents
FCC 15.109
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 15.109 Radiated emission limits.
(a) Except for Class A digital devices, the field strength of radiated
emissions from unintentional radiators at a distance of 3 meters shall not
exceed the following values:
Frequency of emission (MHz) Field strength (microvolts/meter)
30-88 100
88-216 150
216-960 200
Above 960 500
(b) The field strength of radiated emissions from a Class A digital device,
as determined at a distance of 10 meters, shall not exceed the following:
Frequency of emission (MHz) Field strength (microvolts/meter)
30-88 90
88-216 150
216-960 210
Above 960 300
(c) In the emission tables above, the tighter limit applies at the band
edges. Sections 15.33 and 15.35 which specify the frequency range over which
radiated emissions are to be measured and the detector functions and other
measurement standards apply.
(d) For CB receivers, the field strength of radiated emissions within the
frequency range of 25-30 MHz shall not exceed 40 microvolts/meter at a
distance of 3 meters. The field strength of radiated emissions above 30 MHz
from such devices shall comply with the limits in paragraph (a) of this
section.
(e) Carrier current systems used as unintentional radiators or other
unintentional radiators that are designed to conduct their radio frequency
emissions via connecting wires or cables and that operate in the frequency
range of 9 kHz to 30 MHz, including devices that deliver the radio frequency
energy to transducers, such as ultrasonic devices not covered under part 18
of this chapter, shall comply with the radiated emission limits for
intentional radiators provided in § 15.209 for the frequency range of 9 kHz
to 30 MHz. As an alternative, carrier current systems used as unintentional
radiators and operating in the frequency range of 525 kHz to 1705 kHz may
comply with the radiated emission limits provided in § 15.221(a). At
frequencies above 30 MHz, the limits in paragraph (a), (b), or (g) of this
section, as appropriate, apply.
(f) For a receiver which employs terminals for the connection of an external
receiving antenna, the receiver shall be tested to demonstrate compliance
with the provisions of this section with an antenna connected to the antenna
terminals unless the antenna conducted power is measured as specified in
§ 15.111(a). If a permanently attached receiving antenna is used, the
receiver shall be tested to demonstrate compliance with the provisions of
this section.
(g) As an alternative to the radiated emission limits shown in paragraphs
(a) and (b) of this section, digital devices may be shown to comply with the
standards contained in Third Edition of the International Special Committee
on Radio Interference (CISPR), Pub. 22, “Information Technology
Equipment—Radio Disturbance Characteristics—Limits and Methods of
Measurement” (incorporated by reference, see § 15.38). In addition:
(1) The test procedure and other requirements specified in this part shall
continue to apply to digital devices.
(2) If, in accordance with § 15.33 of this part, measurements must be
performed above 1000 MHz, compliance above 1000 MHz shall be demonstrated
with the emission limit in paragraph (a) or (b) of this section, as
appropriate. Measurements above 1000 MHz may be performed at the distance
specified in the CISPR 22 publications for measurements below 1000 MHz
provided the limits in paragraphs (a) and (b) of this section are
extrapolated to the new measurement distance using an inverse linear
distance extrapolation factor (20 dB/decade), e.g., the radiated limit above
1000 MHz for a Class B digital device is 150 uV/m, as measured at a distance
of 10 meters.
(3) The measurement distances shown in CISPR Pub. 22, including measurements
made in accordance with this paragraph above 1000 MHz, are considered, for
the purpose of § 15.31(f)(4) of this part, to be the measurement distances
specified in this part.
(h) Radar detectors shall comply with the emission limits in paragraph (a)
of this section over the frequency range of 11.7-12.2 GHz.
[ 54 FR 17714 , Apr. 25, 1989, as amended at 56 FR 373 , Jan. 4, 1991; 58 FR 51249 , Oct. 1, 1993; 66 FR 19098 , Apr. 13, 2001; 67 FR 48993 , July 29, 2002;
69 FR 2849 , Jan. 21, 2004; 80 FR 33447 , June 12, 2015]
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Goto Section: 15.107 | 15.111
Goto Year: 2014 |
2016
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